No partnership agreement in writing, or agreement in writing between copartners, either previously or subsequently entered into, is deemed testamentary in character, or for that reason invalid or unenforceable, because the agreement contains a provision: (1) regulating, in the event of the death of any of the partners, the transfer, distribution, or other disposition of the assets of the partnership, or any of them, to or among the surviving partners or any of them, or their successors, or the estate of the deceased partner; or (2) regulating, in the event of death, the use of the firm name by the surviving partners, or their successors, or any of them; or (3) regulating the destination, distribution, or other disposition of the proceeds of any policy or policies of insurance upon the life of any partner; nor is any provision contained in any partnership agreement or in any agreement between copartners testamentary in character or for that reason invalid or unenforceable; provided, however, that this section shall not be construed to affect the rights of the heirs, next of kin, devisees or creditors of a partner who has deceased prior to March 10, 1932.